The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 29, 1996
Filed:
Nov. 10, 1994
Patrick J Griesemer, Franklin, WI (US);
Spacesaver Corporation, Fort Atkinson, WI (US);
Abstract
Obstacles are protected against collision in aisles adjacent mobile storage units with an IR transmitter mounted in spaced apart relation to an IR receiver on a unit. For initializing and calibrating the system a microcomputer controls the transmitter to emit IR pulses of increasing width at a uniform repetition rate. If there is no defect in the system the receiver responds with output electric pulses after the IR pulse width is reached that has the minimum integrated energy to exceed the input signal threshold of the receiver. The minimum energy pulse width is stored in the microcomputer and the system switches to a run mode allowing storage units to move when commanded. The computer responds to the absence of returned pulses from the receiver by inhibiting the system so the mobile unit will not run. If returned pulses are not in the proper phase relationship the system goes into a diagnostic mode wherein the interval between transmitted IR pulses is reduced in increments for reasons including determining if there may only be temporary ambient IR interference. If the problem does not clear up by the time the interval is reduced to one-half normal interval the system locks out.